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Share-Based Compensation (Additional Information On Stock Options Outstanding) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
Apr. 03, 2015
Option Price Less Than Closing Price Of Common Stock At End Of Quarter [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Exercisable 5.0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Exercisable $ 7.93us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Number of Shares, Unexercisable 1.1onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Unexercisable $ 7.10onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Number of Shares, Total 6.1us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Total $ 7.78us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember
Option Price Above Closing Price Of Common Stock At End Of Quarter [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Exercisable 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Exercisable $ 0.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Number of Shares, Unexercisable 0onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Unexercisable $ 0.00onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Number of Shares, Total 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Weighted Average Exercise Price, Total $ 0.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember
Total Outstanding [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Exercisable 5.0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember
Weighted Average Exercise Price, Exercisable $ 7.93us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember
Number of Shares, Unexercisable 1.1onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember
Weighted Average Exercise Price, Unexercisable $ 7.10onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember
Number of Shares, Total 6.1us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember
Weighted Average Exercise Price, Total $ 7.78us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= onnn_TotalOutstandingMember